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LONG-TERM DEBT - Schedule Of Cash Flow Hedges Related to Derivative Instruments On the Balance Sheet (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |  |  |  |
Cash flow hedge derivatives, assets | $ 0 |  | $ 0 |  | $ 820
Cash flow hedge derivatives, liabilities | 6,084 |  | 6,084 |  | 1,942
Unrealized (loss) gain resulting from changes in fair value of derivative instruments | (774) | $ 863 | (5,292) | $ 1,503 |
Other current assets | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Cash flow hedge derivatives, assets | 0 |  | 0 |  | 338
Other non-current assets | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Cash flow hedge derivatives, assets | 0 |  | 0 |  | 482
Other accrued liabilities | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Cash flow hedge derivatives, liabilities | 1,686 |  | 1,686 |  | 387
Other long-term liabilities | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Cash flow hedge derivatives, liabilities | $ 4,398 |  | 4,398 |  | 1,555
Accumulated other comprehensive loss | Designated as Hedging Instrument | Interest rate swaps |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |
Unrealized (loss) gain resulting from changes in fair value of derivative instruments |  |  | (6,459) |  | (1,196)
Accumulated other comprehensive loss, interest rate swaps, tax provision |  |  | (112) |  | (112)
Accumulated other comprehensive loss |  |  | $ (6,571) |  | $ (1,308)

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